I found a near identical match at Urban Outfitters. (I don't consider this breaking SYC since the Nordstrom brand polka dot hose are already starting to wear out - I was looking for a suitable replacement.)
http://www.urbanoutfitters.com.....ngPriority
The only difference is in the sizing (S/M and L/XL instead of the Nordstrom brand sizing) and the Nordstrom tights had a reinforced toe, which the UO tights do not.
The quality seems similar, so these will probably not last a terribly long time - I have noticed that my Nordstrom tights always start wearing out in spots within about 10 wears.
Anyway, I just wanted to mention it in case any of you were looking for replacements.
Angie's Nordstrom tights: http://youlookfab.com/2010/11/.....ur-spirit/
My Nordstrom tights: http://youlookfab.com/fab/uplo....._image.jpg
My UO tights: http://youlookfab.com/fab/uplo....._image.jpg